Electromedical apparatus



IASLWYU,

W. H. MEYENBERG.

ELECTROMEDIGAL APPARATUS.

APPLICATION FILED JAN.13, 1921.

D Patented Oct. 10, 1922.,

J ,1 7206mm Magenta/3;

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atented Uct. 1U, 1%22.

Application filed January 13, 1921.

a To all whom it may concern.

tric circuit, the voltage a Be it known that I, WILLIAM H. Martin- BERG,a citizen of the United States, and a resident of Lemont, in the countyof Cook and State of Illinois, har e invented certain new and usefulImprovements in Electromedical Apparatus, of which the following is aspecification. v

This invention relates to improvements in electrorlnedical apparatus andlike v ibratory devices employing an inductive coil of the vibratortype.

The device herein illustrated as embodying the invention is moreespecially designed for use in connection with eleotro-medical apparatusin which electric current utilized as a curative agent. Suchelectricalapparatus serves the usual function of intensifying the current, therebeing ordinarily provided additional mechanism for controlling, by hand,the rate of vibration of the armature of the induction coil, whichelement is ordinarily termed the vibrator.

An induction coil designed for the purposes above suggested, andembodying the invention, is illustrated in the accompanying drawing inwhich- Fig. 1 is a view in side elevation of an induction coil togetherwith the regulating de vices therefor, with parts shown in section,

Fig. 2 is an enlarged detail view taken on line 2, 2 of ig. 1, showingthe coil in end elevation and adjacent parts in section,

Fig. '3 is a detail view in elevation, as taken on line 3, 3 of Fig. 1,and

Fig. 1 is an enlarged view in vertical section, taken on line i, 4 ofFig. 2, and sshowing an improved detail of construction.

An elementary induction coil, as known in the art of electricity,consists of a soft iron core about which is wound, at least twoseparatecircuits, one circuit consisting of a relatively large number ofturns of fine wire and termed the secondary circuit, and theothercircuit consisting of a relatively small number-of turns of coarsewire, and termed the primary circuit. Without going into a detailedexplanation of the electrlcal phenomena of the induction coil, it issufficient to statethat if this coil is placed in an electhe dischargeend of the circuit may be increased or raised, the nature or frequencyof the impulses in the current being controlled by means of avibratingarmature having the form of a metallic strip of metal fixed at one endand ter- WILLIAIVI I-I. MEYENBERG, LEMON'I, ILLINOIS, ASSIGNOR TO J. J.BLEADON, 0F

- CHICAGO, ILLINOIS.

ntncrnolunnrcan arrana'rus.

Serial No. 436,888.

minating at its free end in close proximity to one end of the core ofthe induction coil. As clearly shown in Fig. 1, the coil 1 is cylindricin form and surrounded by an insulated covering which conceals the wire.At one end of the coil is mounted a disk or end plate 2, preferably ofinsulating material, which serves as a support for the vibrator 3 whichis fixed at one end adjacent the periphery 6 of the disk 2 and extendsradially toward the center of the coil, terminating at a distance fromthe extremity of the iron core 4-. As a preferable construction, acontact plate 5 is mounted at the free end of the vibrator arm 3. Spacedfrom one end of the induction coil, that is, the vibrator end, ismounted an annular plate 6 having screw threads about its periphery,this plate being made of insulating material, such as molded rub- 7proximity to the arm 3 of the vibrator, there being mounted on thevibrating armature 3 and the end of the stem, a pair of platinum contactpoints 9. The stem 7 is preferably mounted in a threaded bushing 10fixed in theplate 6, and adjacent the inner end is mounted a milledwheel 11 adapted to engage a spring finger 12 fixed to the inner surfaceof the plate 6 by means of the bushing 10, said spring fingerco-operating with the milled wheel to to the degree of rotation'of thestem 7 by means of retarding effect thus produced and the clicks thatare readily sensed as the stem is rotated.

The annular plate end plate 2 of the induction coil 1 and permanentlyspaced therefrom by means of one or more pins 13 which bridge the spaceseparating the plates and secured at its ends thereto in a manner aboutto be described.

The pins are preferably made ofhard rubber or other suitable materialand have their outer ends embedded in the plate 6 and secured oranchored in position by .providing an annular groove j acent theextremity,

this groove forming a permanent connection .between the pin and 1 thusclosing the 80 afford an indication as 95 6 is connected to tholOO 13(Fig. 4) adthe plate 6, it being understood that the latter wouldordinarily be made of hard rubber and the end of the pin 13 embeddedduring the molding process and while the rubber is in a plasticcondition... The pin thus em bedded projects from the rear face of theplate 6 and in the operation of assembling the parts, the outer end ofthe pin abuts against the plate 2 of the induction coil. The outer endof the pin 13 is tapped, as shown at 14c (Fig. 1) and a screw 15 isinserted through the plate 2 from the oppo site side thereof and'turnedinto the tapped recess 14. A connection of this kind is substantiallypermanent after the assembly of the apparatus has been completedinasmuch as there are no connecting members such as screws or the likeextending through the plate 6 and exposed on the outer surface thereof.Thus, the possibility of undesired tampering with and disconnection ofthe partsis prevented by persons bent on investigating the interior ofthe device.

Referring now more in detail to the constructlon of the vibrator, thesame may be described as a metallic strip or leaf which is fixed at itsouter end and free to vibrate under the magnetic influence of the coreof the coil 1. It was also pointed out that the vibrator consists of anarm 3 extending parallel to and spaced from the plate 2 of the coil.This arm 3 is'the free end portion of a strip of metal which is bent orformed at its outermost end in rectangular form, thus providing a'hollowor box-like extremity 16. This formation is obtained by bending the endportion, first at right angles to the free vibrating arm 8, then bendingit again parallel to the arm, and still again at right angles so thatthe extremity of the strip abuts against the arm 3at a distance from theouter end thereof. One of the portions 17 parallel with the arm 3 formsa base plate and is provided with ears 17 17 (Fig. 2) through whichsmall screws 18, 18 extend into the plate 2. Passing through thevertical and parallel wall portions of the box-like extremity 16 andanchored in the plate 2 adjacent the periphery thereof is a larger screw19 having a square head serving as an adjustment member, as willpresently be pointed out. Bearing in mind that the metallic strip ofwhich the vibrator is made is more or less resilient, it will be seenthat by varying the pressure exerted against the outer portion of thearm 3 through the medium of the screw 19, a definite effect is producedupon the vibratory action of the arm. In the first place, the abuttingend portion of the strip bearing against the arm 3 intermediate thescrew 19 and the free end portion of the arm acts as a fulcrunr with theresult that by turning'the screw 19 inwardly against theadjacent'portion of the arm 3 the amplitude of vibration of said arm maybe regulated inasmuch as it is clear that if the adjusting screw head isspaced away from the arm 3 the eilective length of the arm 3 extendsbeyond this fulcrum point, thus increasing the ellective length of thearm and hence the amplitude of vibration, whereas by tightening thescrew 19 the length of the arm is shortened. thus decreasing theamplitude. And finally, if

an extreme pressure is exerted by the screw head, the metal of the stripadj aeent thereto and beyond the fulcrum point is actually depressedinwardly, thus throwing the free end portion or arm 3 outwardly in theopposite. direction and away from the end of the core 1. In this mannerthe desired adjustment of the vibrator may be determined by test, andwhen thus determined it will remain set without the necessity of furtheralteration. However, this adjustment is permanent, as distinguished fromthe adjustment or regulation by means of the stem 7 which controls thespacing of the platinum contact points, but not the predeterminedamplitude of vibration of the metallic arm 3. (lbviously, the tensionadjustment of the screw 19' would not be made other than by personsskilled in the art and in the act of making repairs which wouldordinarily necessitate dismounting the complete vibrator unit.

Having described a preferred construetion embodying the invention, Iclaim- 1. In a device of the character described. and in combination, acoil, a vibrator mounted on the coil and comprising a resilient stripfixed at one end, a stop spaced from the end of the strip, and meansinterposed. between said fixed end and the stop, adapted adjustably tobow the portion of the strip between said end and the stop.

2. In a device of the character described, and in combination. a coil, avibrator mounted on the coil and comprising a resilient strip, a stop,means for adjusting a portion of said strip toward or away from thecoil, said stop being located between said means and the free end of thevibrator, whereby said stop and said means cooperate to vary theinclination of said resilient strip.

3. In a device of the character described, the combination of aninduction coil including a vibrator comprising a resilient metallic armmounted upon said coil in vibrating position, the fixed end of saidstrip being bent to form a box-like extremity, and an adjust ing screwextending therethrough and anchored in said coil.

1. In a device of the character described, the combination of aninduction coil including a vibrating member comprising :1 metallic stripbent at one end to form a box-like extremity adapted to bear againstsaid coil with the free end of said strip spaced outwardly from the endof said coil, and a screw inserted through said box-like extremthecombination of ity and adapted to be adjusted endwise to vary thepressure on the fixed end of said strip. 7

5. In a device of the character described,

an induction coil including a vibrator comprising a resilient metallicarm adapted to be mounted. upon said coil in vibrating position, thefixed end of said strip being successively bent at right angles toprovide an offset portion parallel to said arm and forming a base plateand a portion at right angles to said arm, and an adjust- Inent screwextending through the arm and base plate.

6. In a device of the character described, the combination of aninduction coil including a vibrating member comprising a metallic stripbent at its fixed end to form a boxlike extremity forming a base plateand a fulcrum point inwardly from the outer end of said arm, and anadjusting screw inserted through said box-like extremity intermediatethe outer end of said arm and saidiuh crum point.

7. Ina device of the character described, the combination of aninduction coil, a plate spaced from one end of the coil, a vibratorregulating member mounted in the plate, and means for connecting saidplate with.

said induction coil comprising a pin embedded in the rear face of saidplate and having detachable connection with said coil.

8. In a device of the character described, the combination of aninduction coil, a plate spaced from one end of the coil, a regulatingmember mounted in the plate, and means for tilt connecting said platewith said induction coil comprising a pin embedded at one end in therear surface of said plate and extending rearwardly and abutting at itsouter end against said coil, and means for connecting the outer end ofsaid pin with said coil.

9. In a device of the character described, the combination oianinduction coil including a vibratory member mounted at one end of saidcoil, a plate spaced from the vibrator end oi the coil, a vibratorregulating member mounted in the plate, and means for connecting saidplate with and spacing it from said induction coil comprising a pinembedded at one end plate and having screw threaded connection with saidcoil at its other end.

10. In a device of the combination of an induction coil including aplate having a vibrating member mounted thereon at one end of said coil,a closure plate spaced from said vibrator end of the coil, a vibratorregulating member mounted in the closure plate, and means for connectingsaid closure plate with said induction coil comprising a pin embedded atone end in the rear extending rearwardly and abutting at its outer endagainst the regulator plate, and a screw extending through said vibratorplate and engaging a tapped depression in the abutting end of said pin.

In witness whereof, I hereunto subscribe my name this 10th day ofJanuary, A. D.

WILLIAM H. MEYENBERG.

in the rear face of said the character described,

face of said plate and

